package com.scu.qingshi.ws;
import java.io.IOException;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicLong;
import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;

import cn.hutool.json.JSONObject;
import org.apache.commons.lang.StringUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.stereotype.Component;


/**
 * 推送有新的申请
 * @author qingshi
 */
@ServerEndpoint("/newApply/{openId}")
@Component
public class CommunityWebSocketServer {

    private final Logger logger = LogManager.getLogger(this.getClass());

    /**用来记录当前在线连接数。应该把它设计成线程安全的。*/
    private static AtomicLong onlineCount = new AtomicLong(0);
    /**concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。*/
    private static ConcurrentHashMap<String, CommunityWebSocketServer> webSocketMap = new ConcurrentHashMap<>();
    /**与某个客户端的连接会话，需要通过它来给客户端发送数据*/
    private Session session;
    /**接收openId*/
    private String openId="";

    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session,@PathParam("openId") String openId) {
        this.session = session;
        this.openId=openId;
        if(webSocketMap.containsKey(openId)){
            webSocketMap.remove(openId);
            webSocketMap.put(openId,this);
            //加入set中
        }else{
            webSocketMap.put(openId,this);
            //加入set中
            addOnlineCount();
            //在线数加1
        }

        logger.info("社团 {} 上线，目前在线社团数量 ： {}",openId,getOnlineCount());
        try {
            JSONObject object = new JSONObject();
            object.putOnce("type","test");
            object.putOnce("data",openId+", 连接成功");
            sendMessage(object.toString());
        } catch (IOException e) {
            logger.warn("社团:{} 网络异常",openId);
        }
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    synchronized public void onClose() {
        if(webSocketMap.containsKey(openId)){
            webSocketMap.remove(openId);
            //从set中删除
            subOnlineCount();
        }
        logger.info("社团 {} 下线，当前在线社团数：{}",openId,getOnlineCount());
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message 客户端发送过来的消息*/
    @OnMessage
    public void onMessage(String message, Session session) {
//        System.out.println("用户消息:"+userId+",报文:"+message);
//        //可以群发消息
//        //消息保存到数据库、redis
//        if(StringUtils.isNotBlank(message)){
//            try {
//                //解析发送的报文
//                JSONObject jsonObject = JSON.parseObject(message);
//                //追加发送人(防止串改)
//                jsonObject.put("fromUserId",this.userId);
//                String toUserId=jsonObject.getString("toUserId");
//                //传送给对应toUserId用户的websocket
//                if(StringUtils.isNotBlank(toUserId)&&webSocketMap.containsKey(toUserId)){
//                    webSocketMap.get(toUserId).sendMessage(jsonObject.toJSONString());
//                }else{
//                    System.out.println("请求的userId:"+toUserId+"不在该服务器上");
//                    //否则不在这个服务器上，发送到mysql或者redis
//                }
//            }catch (Exception e){
//                e.printStackTrace();
//            }
//        }
    }

    /**
     *
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        logger.error("社团错误：{}, 原因:{}",openId,error.getMessage());
        error.printStackTrace();
    }
    /**
     * 实现服务器主动推送
     */
    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
    }


    /**
     * 发送自定义消息
     * */
    public static void sendInfo(String message,@PathParam("openId") String openId) throws IOException {
        if(StringUtils.isNotBlank(openId)&&webSocketMap.containsKey(openId)){
            webSocketMap.get(openId).sendMessage(message);
        }
        else {
            System.out.println("社团不在线");
        }
    }

    public static long getOnlineCount() {
        return onlineCount.get();
    }

    private static synchronized void addOnlineCount() {
        onlineCount.incrementAndGet();
    }

    private static synchronized void subOnlineCount() {
        onlineCount.decrementAndGet();
    }
}